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Research Papers: Flows in Complex Systems

Fluid Vibration Induced by High-Shear-Rate Flow in a T-Junction

[+] Author and Article Information
Gaku Tanaka

Graduate School of Engineering,
Chiba University,
1-33 Yayoi-cho, Inage-ku,
Chiba 263-8522, Japan
e-mail: gtanaka@faculty.chiba-u.jp

Ryuhei Yamaguchi

Graduate School of Engineering,
Chiba University,
1-33 Yayoi-cho, Inage-ku,
Chiba 263-8522, Japan
e-mail: yryuhei63@gmail.com

Hao Liu

Graduate School of Engineering,
Chiba University,
1-33 Yayoi-cho, Inage-ku,
Chiba 263-8522, Japan
e-mail: hliu@faculty.chiba-u.jp

Toshiyuki Hayase

Institute of Fluid Science,
Tohoku University,
2-1-1 Katahira, Aoba-ku,
Sendai, Miyagi 980-8577, Japan
e-mail: hayase@ifs.tohoku.ac.jp

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received June 20, 2015; final manuscript received February 7, 2016; published online May 2, 2016. Assoc. Editor: Mark F. Tachie.

J. Fluids Eng 138(8), 081103 (May 02, 2016) (8 pages) Paper No: FE-15-1418; doi: 10.1115/1.4032935 History: Received June 20, 2015; Revised February 07, 2016

For laminar flow in the side branch of a T-junction, periodic fluid vibrations occur with the Strouhal number independent of characteristic flow conditions. As the mechanics is unknown, an experiment was performed to establish the underlying cause in high-shear-rate flow. The fluid vibration appears along both the shearing separation layer and the boundary between two vortices immediately downstream of the side branch, where the shear rates are several orders larger than those further downstream. This vibration is caused by flow instability induced in two types of high-shear-rate flow confirming that is a universal phenomenon associated with the geometry of the T-junction.

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Figures

Grahic Jump Location
Fig. 1

Schematic of T-junction

Grahic Jump Location
Fig. 2

Secondary velocity in the side branch (NW—near wall and DW—distant wall): (a)QS/QT = 0.25 and (b) QS/QT = 0.50

Grahic Jump Location
Fig. 3

Streamlines of secondary flows in the side branch: (a) QS/QT = 0.25 and (b)QS/QT = 0.50

Grahic Jump Location
Fig. 4

Velocity vector and oscillation point on the median plane in the side branch: (a) QS/QT = 0.25 and (b) QS/QT = 0.50

Grahic Jump Location
Fig. 5

Power spectrum on the median plane in the side branch: (a) QS/QT = 0.25, y/RS = 3.04 and (b) QS/QT = 0.50, y/RS = 3.04

Grahic Jump Location
Fig. 6

Spectral analysis of the axial velocity in side branch: (a) QS/QT = 0.25 at P1 (x/RS = 0.09 and y/RS = 3.04) in Fig. 5(a) and (b) QS/QT = 0.50 at P2 (x/RS = − 0.010 and y/RS = 3.04] in Fig.5(b)

Grahic Jump Location
Fig. 7

Secondary velocity profile on the boundary of two vortices at section S3: (a) QS/QT = 0.25, shear rate downstream of the side branch = 24 s −1 and (b) QS/QT = 0.50, shear rate downstream of the side branch = 47 s−1

Grahic Jump Location
Fig. 8

Tangential velocity profile along shearing separation layer: (a) QS/QT = 0.25, shear rate downstream of the side branch = 24 s−1 and (b) QS/QT = 0.50, shear rate downstream of the side branch = 47 s−1

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